Question
PSLE
John and Sofia started their walk around a 19-km track at 7.00 a.m. They started at the same point but went in opposite direction. John's walking speed was 6 km/h and Sofia was 4 km/h. They did not change their speeds throughout. At what time did they first pass each other?
2 m

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PSLE
John and Sofia started their walk around a 19-km track at 7.00 a.m. They started at the same point but went in opposite direction. John's walking speed was 6 km/h and Sofia was 4 km/h. They did not change their speeds throughout. At what time did they first pass each other?